I've always been a fan of Thunderbirds, with the 58-60 as my favorites. I do know about the unibody design. The 1958 came with a 300 horsepower 352 V8. 1959 and 1960 came with the standared 352 V8,m but also had the opitional 350 horsepower Lincoln 430 V8. My grandfather had a 1960 with the 430 V8 and my dad's 1960 has the standard 352. I also had a 1959. That one someone prior had swapped out the original with a 300 horsepower 390 V8 out of a newer Thunderbird. Having driven my 59 and my dad's 60, the 300 horsepower is plenty power to haul the car. I would like to drive one with the 430 V8. I'm sure that it really "gets up and goes". My 59 with the 390, I could burn some rubber with that.